Underground Mining Bord And Pillar

Room and pillar mining - Wikipedia

Room and pillar (variant of breast stoping), also called pillar and stall, is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars The ore is extracted in two phases

Bord and pillar mining – Coal and coal mining – Te Ara

Bord and pillar mining Next This diagram shows the traditional method of bord and pillar mining Miners first extracted coal along roadways or bords, while the coal in between the bords acted as pillars holding up the roof Then the outer pillars were mined, leaving the roof to collapse in a controlled way as miners retreated to the exit

bord and pillar coal mining ppt - betruizfr

Bord-and-pillar: Bord-and-pillar, or room-and-pillar, is the oldest underground mining technique and was common in NSW before longwall mining began in the 1960s This method uses a grid of tunnels and involves progressively cutting panels into the coal seam whilst leaving behind pillars of …

Design of Bord and Pillar method in coal mines - SlideShare

One of such methods is the Bord and Pillar method of mining Bord and Pillar method of mining is one of the oldest methods 3 INTRODUCTION In India, about 98% of underground output of coal is obtained by Bord and Pillar method and barely about 2% by longwall methods

Bord-and-pillar mining in inclined orebodies - SAIMM

different bord-and-pillar layouts were designed These layouts were then evaluated according to dilution, produc-tivity, cost implications, profit and mining flexibility and the most suitable layout was chosen Bord-and-pillar mining was then compared to conven-tional mining according to the following: financial analysis, dilution and flexibility

Research Report on the Coal Pillar Recovery under Deep Cover

underground coal mines where retreat mining in room-and-pillar operations is utilized Among other things, the recommendations should identify means of adapting any practical technology to the mining environment to improve miner protections during

Coal Mining Methods - EMFI

Coal Mining Methods Underground Mining Longwall & Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal underground, with room-and-pillar being the traditional method in the United States Both methods are well suited to extracting the

Bord & Pillar Method | Mining | Coal Mining

Gallery (bord) 2Basic parameters of bord and pillar mining system 1 Pillar 3 Junction Calculation of percentage of extraction during development • If coal from the full seam thickness is extracted the percentage of extraction during development is nearly 20% in deep mines and 35% in shallow mines 5 m and preferably 1

CONTINUOUS MINER – Mining Science and Technology

In underground mining, first and foremost in the modernization process are the machines that extract coal: primarily the continuous and longwall miners First introduced in the late 1940’s, continuous miners provided a quantum leap in the speed and efficiency of extracting coal

Mining Funda

Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of …

Vijaya Raghavan*, Dr Syed Ariff**, Paul Prasanna Kumar***

31 Overall working of bord and pillar method of mining using Continuous Miner: The bord and pillar method of mining is the older and traditional method of underground coal mining This method is sometimes called room-and-pillar mining Coal is removed from the working faces as the rooms are advanced Cross-cuts,

Roof Instability - PubMed Central (PMC)

Falls of roof continue to be a major hazard in underground coal mining This study examined 11,600 reportable noninjury roof falls that occurred from 1999 to 2008 in room-and-pillar operations in the bituminous coal sector

Toward Pillar Design to Prevent Collapse of Room-and

underground miners Traditional strength-based pillar design methods applicable to coal or hard-rock mines use a factor of safety defined as pillar strength divided by pillar stress Factor of stability, defined as local mine stiffness divided by post-failure pillar stiffness, may offer a way to design room-and-pillar mines and eliminate collapses

NSW Mining Methods - NSW Mining

Bord-and-pillar: Bord-and-pillar, or room-and-pillar, is the oldest underground mining technique and was common in NSW before longwall mining began in the 1960s This method uses a grid of tunnels and involves progressively cutting panels into the coal seam whilst leaving behind pillars of coal to support the mine

bord and pillar coal mining ppt - bliksembeveiligingepabe

applications of room and pillar underground mining method

prevalent in the Indian underground mines is the Bord and Pillar method of mining because of its history and ease of operation The most important aspect of Bord and Pillar mining is , 【Live Chat】 Room and Pillar Mining | Safe & Efficient | Sunrise Coal

Bord and Pillar Method of Working | Coal Mining | Mining

There are two basic methods of underground coal mining methods They are i) Bord and Pillar method ii) Longwall method Although Type of machineries in Bord and Pillar mining (Source: Scoble, 1993) Documents Similar To Bord and Pillar Method of Working JOE LOUIS Uploaded by 789rahul generating electricity from coal Uploaded by

(PDF) Underground Mining Methods: Room and Pillar method

UNDERGROUND MINING FACT SHEET

Coal is produced from underground mines using longwall or room-and-pillar mining technology Longwall mining consists of developing the coal in rectangular blocks called “panels,” using room-and-pillar mining equipment Longwall panels are developed to maximize the recovery of coal and are up to 900 feet wide by 10,000 feet long

Mining - Underground mining | Britannica

Mining - Underground mining: When any ore body lies a considerable distance below the surface, the amount of waste that has to be removed in order to uncover the ore through surface mining becomes prohibitive, and underground techniques must be considered

Subsidence from Underground Mining: Environmental …

efficient than room-and-pillar mining, it is being promoted increasingly in the United States Also, longwall mining induces a generally uniform and contemporaneous surface subsidence that can be Technical terms used herein are defined in the glossary, p 25 more accurately forecast than subsidence caused by room-and-pillar mining

Bord and Pillar mining by continuous Miner in HINDI - YouTube

EVALUATION OF UNDERGROUND COAL PILLAR DESIGN

include opencast mining and underground mining The two common methods of underground mining include Longwall mining and Bord and Pillar method of mining The method mostly prevalent in the Indian underground mines is the Bord and Pillar method of mining because of its history and ease of operation

Underground mining (hard rock) - Wikipedia

Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds or rubies

Bounty to expand Cook using bord and pillar methods

BOUNTY Mining intends to expand operations at the Cook Colliery in Queensland to four underground mining areas, producing 22 million run-of-mine tonnes per annum using bord and pillar mining methods after raising $18 million through an initial public offering

Room and pillar mining - Wikipedia

Room and pillar mining (Redirected from Room and pillar ) Room and pillar (variant of breast stoping), also called pillar and stall , [1] is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars

Coal pillar design procedures - MHSC

Coal pillar design procedures G York, I Canbulat, BW Jack An underground pillar monitoring exercise was successful, until the dynamic collapse failure of the pillar, which was not recorded due to the manual nature of the recording A continuous Mining Pillar +, ()=)

Productivity Improvement in Underground Coal Mines - A

Of the total output of coal from underground mines, more than 90% of coal is obtained by the bord and pillar method, the predominant method of mining followed in India, and the rest is mined by the longwall mining …

EVALUATION OF BORD AND PILLAR MINING SYSTEM IN …

Bord and Pillar method of mining Bord and Pillar method of mining is one of the oldest methods of mining The success of Bord and Pillar mining is selecting the optimum pillar size If the pillars are too large, then the extraction ratio decrease leading to less production and profitability and if …

Room and Pillar Mining Method - SlideShare

Room (Bord)-and-Pillar Layout Figure shows Room and Pillar Mining 6 Underground mining: room-and-pillar mining of thick seams –“Benching” Different approaches allow either the top or bottom part of the seam to be mined out first

Room-and-pillar mining | coal mining | Britannica

In coal mining: Development of continuous mining …loading, developed in association with room-and-pillar mining The oldest of the basic underground methods, room-and-pillar mining grew naturally out of the need to recover more coal as mining operations became deeper and more expensive

Topic - Bord And Pillar Mining

Major Mines & Projects | SAEC Mine

Coal mining of the +1 m thick seams is primarily carried out by Cat 993 or 994 loader and Cat 785 rear dump haul truck, which is well proven method of coal operations The Klipspruit is predominantly an underground bord and pillar mining operation with small open pit operations, which is planned to be completed around December 2014

Major Mines & Projects | Khutala Mine

The mine is predominantly an underground bord and pillar mining operation with small open pit operations, which is planned to be completed around December 2014 The underground mine is accessed by a large diameter vertical shaft for men and materials and there is an access decline which is used to transport the coal on a conveyor from